That's going a little too far, don't you think? Are they gonna find him by scent? He probably disguised the voice anyway with the mask, and it's not like they actually know him, he's just a nobody close.
Yes, this is definitely how real people react in that kind of a situation.
(I'm curious btw if in the raw the sisters talk about him with kare (specifically male) pronouns or leave it ambiguous, cause I felt like the use of 'he' was kind of incongruent.)